A HUGE police search has so far failed to find any trace of Steven Hume, the man who abducted his own child at knifepoint yesterday.

Teams of officers are still focussing their search on bush land in Sydney's south-western outskirts near Bargo but have so far failed to find any trace of 24-year-old Hume.

Almost 19 hours after he was abducted, eight-month-old Zhaiden was safe and well last night at Campbelltown police station after being taken there by Hume's sister.

However, it's still unclear whether Zhaiden and his mother Casey have been reunited yet.

Superintendent Dave Eardley, Bankstown Local Area Commander said today it was a relief that the boy was located safely but now his father also needed to be found.

“I think everyone involved in this investigation breathed a collective sigh of relief when we confirmed the young child had been located safe and well.

“However, Bankstown Police and their colleagues from across the state are still urgently trying to locate the child’s father as there are several matters that are unresolved.

“I urge Steven Hume to attend the nearest police station and hand himself in, or contact us and commence some dialogue.

“He is considered dangerous and I ask that members of the public do not approach him but contact Triple Zero immediately (when) he is sighted or his whereabouts become known."

It's been revealed Hume has twice breached AVOs meant to protect the baby's mother but walked free from court.

The last time was just 11 days ago, when Campbelltown Local Court heard how neighbours had to pull Steven Hume off his former girlfriend, Casey Mifsud, after he assaulted her in the street.

Almost 19 hours after he was abducted by his father, eight-month-old Zhaiden was safe and well last night at Campbelltown police station.

He was taken there by one of his aunts - Hume's sister - and was checked by paramedics to ensure he was healthy.

Hume remains on the run after a massive manhunt involving over 1000 people including officers from the tactical operations unit, the dog squad and the police helicopter centred on dense bushland at Bargo, off the Hume Highway south of Sydney.

A Toyota Camry, believed to be his cousin's, was found at 6.50am yesterday by police after it crashed into a tree on Avon Dam Rd.

Police had feared for Zhaiden's welfare because there was no baby capsule in the car.

Police are asking the public to be on alert and report any sightings of Steven Hume. Picture: Media PoliceSource:Supplied

Ms Mifsud, 16, had been living with her father at Kenthurst Place in Chester Hill after moving out of Hume's Rosemeadow home about four months ago.

Zhaiden's grandfather Marco Mifsud said he believed Hume had been watching the house where his former girlfriend was staying on Thursday night.

"He's obviously been watching because he has come just after I left," Mr Mifsud said.

Then, armed with a knife, he broke in through the back door while Ms Mifsud was watching television with their baby.

Police allege he forced Ms Mifsud and the baby into his car about 8.30pm.

Police said when the car stopped an hour later at a Douglas Park truck stop on the Hume Hwy, Ms Mifsud - who had allegedly been assaulted - fled the vehicle. The mum tried to take Zhaiden with her but Hume sped off, leaving her to raise the alarm at a nearby home before being taken to Campbelltown Hospital.

Abducted babySource:DailyTelegraph

Police did not alert the public until yesterday morning.

When Hume appeared before Magistrate Ian Guy at Campbelltown on July 16, he was convicted of breaching a two-year good behaviour bond which had been imposed on him on July 24 last year for contravening an AVO.

He was also convicted of breaching an AVO on April 1 this year.

The court was told Ms Mifsud had gone to Hume's house at Rosemeadow, where he became aggressive.

"All you do is f... things up," he had told her.

"You don't listen to me."

The statement of facts tendered to the court said Ms Mifsud ran out the front door and got past four houses before he grabbed her from behind. Neighbours pulled him off.

Magistrate Guy again placed Hume on a two-year good behaviour bond.

Hume was also convicted of possessing cannabis, possessing a restricted substance, which was Valium, receiving stolen goods, which was an Apple iPhone, and having stolen goods in custody, a Sony Playstation Vita console.

He was also fined $1100.

Mr Misfud said yesterday that his daughter had been beaten by Hume during her 90-minute ordeal last night.

"He was violent before he got there (Douglas Park). He beat her up a bit," he said.

Anyone with knowledge of Hume's whereabouts is asked to call the police.

He is Caucasian, 165 to 175 cm tall, thin build, with brown hair, and wearing a blue jumper and green track pants.